So the younger they are when they start dating, the longer they date before marriage.
"Marriages are becoming stronger than ever, relationships happier and more committed than ever, and couples more independent and consensual in their decisions than ever," Bridebook founder Hamish Shephard said.
And that is what a boyfriend and girlfriend relationship helps us discover.
It's no secret that marriage traditions are changing.
People are marrying later in life, too, a fact that may come as no surprise.
Today's bride and groom are eight years older than the average couple who got married in 1971.